John rae



J. RAE.

ARG LAMP.

(No Model.)

WIT/VESSES:

/Nv 70H Arron/ms.

UNITED STATES PATENT OFFICE.

Jol-IN RAE, or NEW YORK, Y,

ARC-LAM P.

SPECIFICATION forming part of Letters Patent No. 572,064, dated November24, 1896. Application filed November 26, 1895, Serial No. 57(`),162. (Nomodel.)

To all whom it muy concer/L:

Beit known that I, JOHN RAE, of New York city, in the county and Stateof New York, have invented new and useful Improvements in Arc-Lamps, ofwhich the following is a full, clear, and exact description.

The object of the invention is to provide an are-lamp which will permitof throwing the greater portion of the light downward without castingshadows of the carbon or lampframe; also to provide a spark-arrester t-opre vent the escape of sparks and small pieces of hot carbon.

My invention consists in a lamp-frame provided with a holder forsupporting a transparent or translucent chimney which incloses theadjacent ends of the carbon-rods; also a chimney-top supported by thelamp-frame and inclosing the upper end of the chimney7 with anintervening airspace.

It also consists in the combination, with the carbons and chimney, of aflaring shade and reflector for throwing the light downward and underthe center of the lamp, all as will be hereinafter more fully described.

Reference is to be had to the accompanying drawings, forming a part ofthis specification, in which similar characters of reference indicatecorresponding parts in all the views.

Figure 1 is a vertical transverse section of a lamp, showing theapplication of my improvement. Fig. 2 is a plan view of the upper partof the lampframe,showing the chimney-top holder. Fig. 3 is a horizontalsection taken on line 3 3 in Fig. 1, and Fig. 4 is a vertical transversesection showing a modified form of shade and reflector.

The rods A A', forming a portion of the framework of the lamp, supportthe plate B, which holds the lower carbon C. To the boss o, which holdsthe lower carbon, is iitted a collar l), provided with a flange adaptedto support a chimney D, which surrounds the lower carbon C and the uppercarbon E. The flange of the collar b is perforated to allow of thecirculation of air through the chimney.

To the rods A A' is. attached an annular plate F, which is provided witharms c c', cl CZ'. To the arms c c are secured clamping-pieces e e bymeans of screws passing through the clamping-pieces into the arms c c'.The rods AA are received between the clamping-pieces e e and the arms cc.

The annular plate F surrounds the upper portion of the chimney D andsupports the chimney-top D', leaving an air-space between it and theupper end of the ehimneyD. There is an opening f between the chimney Dand the annular plate F, which permits of a draft of cold air throughthe said annular plate over the upper end of the chimney D and throughthe chimney-top D', which extinguishes any sparks that may pass out ofthe chimney D.

In the arms c c are inserted hooks g, which support the flaring shadeand reflector G. The said shade or reiiector is formed to receive thelight of the arc and reiiect it to a point under the lamp, therebydestroying any shadow that might be cast by the direct rays of the are,giving a practically uniform illumination over a surface of from twentyto thirty feet in diameter.

In the modification shown in Fig. t the ilaring shade and reileetor G'is made integrally with the chimney-top D', the shade and reilectorbeing perforated to receive the rods A A and the arms c c', d cl. I mayplace a piece of wire-gauze or perforated metal over the apertures ofthe flange of the collar b toV prevent any possible escape of sparks ina downward direction.

It is obvious that my improvement accomplishes two important results,one of which is the arresting or extinguishing of the sparks, the otherbeing the destruction of the shadow of the lamp.

Having thus described my invention, I claim as new and desire to secureby Letters Patentl. The combination with the carbon-supporting rods ofan arc-lamp, of a chimney supported by the rods and adapted to surroundthe supported carbons, and a chimneytop into which the upper end of thecarbonsurrounding chimney extends, there being an annular air-spacebetween the rst-named chimney and the said chimney-top, substantially asspecified.

2. The combination with the carbon-supporting rods, of an arc-lamp, of acarbon-protecting chimney supported by the rods, an

IOO

a carbon-surrounding chimney supported on said flange, an annular plateclamped to the frame-rods, a chimney-top supported by said annularplate, and downwardly-extending I5 shade or reflector' supported fromits lower edge by said annular plate, substantially as specified.

J OHN RAE.

JOHN C. SULLIVAN,

Titnessesz FRANK J. STEARNS.

lll

